<!DOCTYPE HTML>
<title>Testcase, bug 1379306</title>
<style>

table { background: yellow }
td { height: 50px; width: 200px; background: aqua; }
div { background: fuchsia; height: 10px; width: 20px }

tbody { position: relative; border: 10px solid blue }
div { position: absolute; top: 0; left: 0 }

</style>
<h1>Table Row Group Testcase, bug 1379306</h1>

<table>
  <tbody>
    <tr>
      <td>
        <div></div>
      </td>
    </tr>
  </tbody>
</table>